[FIX] stock_account: get unit_cost in sudo mode

Commit ad5ac19218 adds a sudo() in the
test condition but not inside the condition.

Close #69144

closes odoo/odoo#69197

X-original-commit: 7cd23a2cd464ccdfcb028b4f2c948654634b973c
Signed-off-by: William Henrotin <Whenrow@users.noreply.github.com>

addons/stock_account/models/stock_move.py

@@ -31,7 +31,7 @@ class StockMove(models.Model):
         price_unit = self.price_unit
         # If the move is a return, use the original move's price unit.
         if self.origin_returned_move_id and self.origin_returned_move_id.sudo().stock_valuation_layer_ids:
-            price_unit = self.origin_returned_move_id.stock_valuation_layer_ids[-1].unit_cost
+            price_unit = self.origin_returned_move_id.sudo().stock_valuation_layer_ids[-1].unit_cost
         return not self.company_id.currency_id.is_zero(price_unit) and price_unit or self.product_id.standard_price
 
     @api.model

addons/stock_account/tests/test_stockvaluation.py

@@ -953,7 +953,7 @@ class TestStockValuation(TransactionCase):
         stock_return_picking_action = stock_return_picking.create_returns()
         return_pick = self.env['stock.picking'].browse(stock_return_picking_action['res_id'])
         return_pick.move_lines[0].move_line_ids[0].qty_done = 1.0
-        return_pick._action_done()
+        return_pick.with_user(self.inventory_user)._action_done()
 
         self.assertEqual(self.product1.standard_price, 16)